Recording measuring instrument.



R. VON voss. V RECORDING MEASURING INSTRUMENT. APPLIOATiON FILED MAY 6, 1912.

1,071,1 92. I Patented Au fze, 1913.

UNITED STATEb PATENT OFFICE.

RICHARD voN voss, or wns'rnnn, "NEAR BERLIN, G A ssrenon T0 srnnnns & HALSKE A. e., or BERLIN, GERMANY, A conronA'rron or GERMANY.

RECORDING MEASURING INSTRUMENT.

Specification of Letters Patent.

Application filed May 6, 1912. Serial No. 695,460.

Iatcnted Aug. 26,1913.

To all whom it may concern:

Be it known that I, RICHARD VON Voss, a citizen of the Empire of Germany, and residing at VVestend, near Berlin, Germany, have invented certain new and useful Improvements in Recording Measuring Instruments, of which the following is a specification.

My invention relates to recording measur ing-instruments comprising a bent recording lever, in which the paper strip is guided at the point of the stylus or pen over the outer periphery of a cylinder coaxial with the axis of the system.

It has heretofore frequently been proposed to guide the strip of paper in recording measuring-instruments over a cylindrical face coaxial with the axle of the movable system comprising the writing lever, for the purpose of obtaining diagrams in rectilinear coordinates. In order to be able to make the writing lever as short as possible, in one well-known arrangement of this type the record is made on the internal face of the cylindrically bent paper facing the axle; this arrangement has, however, the disadvantage that the line recorded by the stylus or pen cannot be directly seen. Further, in order to enable the line to be recorded on the outside of the cylindrically bent strip of paper it has heretofore been proposed to make the writing lever projecting forward from the side over the paper in such manner that the pen or stylus can move unimpededly over the entire breadth of the paper. This arrangement has the disadvantage that the writing lever must be sharply bent into the form of a U, so that it is less resisting to bending strains and the casing must be made very broad in order to obtain the space requisite for the movement of the bent lever.

In the arrangement according to my invention the writing lever also moves over the outer face of the cylindrically bent strip of paper, but does not project around over the paper from the side, but down from above in the direction of the movement of the paper. In this arrangement the writing lever need not be bent twice or U-shaped, but only once or L-shaped; it is consequently less exposed to being bent out of shape and also does not occupy any specially great amount of space in the casing.

Two illustrative embodiments of my invention are diagrammatically represented stylus.

by way of example in the accompanying drawing, wherein Figures 1 and 2 are side elevation and top plan view, respectively, showing one form of my improved recording measuring-instrument, the drum carrying the paper having been removed in Fig. 2; Fig. 3 is a side elevation of the second form.

Referring to the drawing, in both illustrative embodiments the axle a of the measuring system m is located to the rear of the pen or stylus s and is directed parallel to the movement of the strip of paper under the point of the stylus. The paper runs at the point of the stylus over a guide 7" whose outer face forms a cylindrical segment 00- axial with the axle a; the strip of paper is held lying against this cylindrical face by a correspondingly bent bar 9. The writing lever h,'bent angularly as shown, and carried by the axle a, projects over the drum t as shown in Fig. 1, or' over the feed roll 6 as shown in Fig. 8, in the direction of the movement of the paper to the point of the Obviously, the writing lever will be the more stable and will the better resist bending'strain the shorter it is made. Having regard to this fact, in the second illustrative embodiment a guide roll 6, and not the paper-drum t as in Fig. 1, is arranged in the space inclosed by the axle and the knee of the bent writing lever, and the strip of paper is led over the guide-roll to the point of the stylus from the paper-drum t located lower down than in the embodiment according smaller diameter than the drum t together with the paper wound on it, in this embodiment the writing lever can be made ma' than in that according to shown in Fig. 3, the guide a row of terially shorter Figs. 1 and 2. As roll 0 is preferably provided with -pins and serves as a feed roll, so that a feed device arranged below the point of the stylus can be dispensed with; the strip of paper to Fig. 1; as this guide roll has a much can hang freely under the point of the stylus and be pulled by gravity between the guides g. I claim:-

1. In a recording measuring-instrument, the combination with-the axle of the measuring system, a drum carrying a strip of paper, and a cylindrical guide coaxial with said axle, the strip of paper being fed from the drum over the outer face of said guide,

a writing lever projecting from the axle and overlapping the paper in the direction of the movement of the paper, said writing lever having a stylus normally contacting with the outer face offthe paper on said guide. 1

2. In a recording measuring-instrument, the combination with the axle of the measuring system, a drum carrying a strip of paper, and a cylindrical guide coaxial with said axle, the drum arranged between said axle and said guide for feeding the paper from the drum over the outer face of the guide and a writing lever carried at one end by said axle and having at the other end a stylus normally cont-acting with the outer face of the paper at said guide, said lever projecting from the axle and overlapping said drum and hangin over the paper down in the direction of t e movement of the paper from the drum to the guide.

3. In a recording measuring-instrument, the combination with the axle of the measuring system, a drum carrying a strip of paper,.and a cylindrical guide coaxial with said axle, of a feed roll arranged between said drum and said guide for feeding the paper from the drum to over the outer face of the (guide, anda writing lever carried at one on by said axle and havin at the other end a stylus normally cont-acting with the outer face of the paper at said guide, said lever projecting from the axle over the feed roll and down over the paper in the direction outer face of said guide, of an elbow writing lever having a substantially horizontal arm carried by the axle and a substantially vertical arm projecting in front of said guide, the vertical arm having a pen normally contacting with the outer face of, the paper on said guide. 1

5. In a recording measuring instrument or the like, a paperdrum rotatable on its axis, a feed roll rotatable on an axis parallel to the axis of said drum, an'axle rotatable on an axis transverse to the other said axes,

a cylindrical paper guide disposed intermediately of said drum and feed roll, the curvature of said guide being concentric with the axis of said axle, and a writing lever overhanging said paper drum and in operative relation to said guide, said-lever being revoluble about said axle.

In testimony whereof, I'have signed my name to this specification in the presence of two witnesses.

\ RICHARD VON VOSS.

Witnesses:

WOLDEMAR HAUPT,

HENRY HASPER. 

